/**
 * v2.1 Phase 4c.3: re-export the DB-layer constant under the historical
 * `SCHEMA_VERSION` name so existing callers (tests/backup.test.ts, docs)
 * keep working. New code should import `CURRENT_SCHEMA_VERSION` directly
 * from src/db.ts.
 */
export declare const SCHEMA_VERSION = 24;
/** Bump on any breaking change to the tar layout (files, manifest structure). */
export declare const ARCHIVE_FORMAT_VERSION = 1;
export interface ExportResult {
    archive_path: string;
    schema_version: number;
    row_counts: Record<string, number>;
    bytes: number;
}
export interface ManifestFile {
    schema_version: number;
    archive_format_version: number;
    created_at: string;
    relay_version: string;
    row_counts: Record<string, number>;
}
interface ExportOptions {
    /** Override the destination path. Defaults to ~/.bot-relay/backups/relay-backup-<iso>.tar.gz */
    destinationPath?: string;
}
/**
 * Produce a consistent snapshot of the current relay DB and config at
 * `destinationPath` (tar.gz). Opens its own read-only connection to the source
 * DB so it is safe to call while the relay daemon is running.
 */
export declare function exportRelayState(options?: ExportOptions): Promise<ExportResult>;
export interface ImportResult {
    restored: true;
    schema_version: number;
    archive_format_version: number;
    previous_backup_path: string;
    row_counts: Record<string, number>;
}
interface ImportOptions {
    /** Bypass schema-version-lower and daemon-running refusals. */
    force?: boolean;
}
/**
 * Restore relay state from an archive. Always safety-backs-up the current
 * DB first; if that safety-backup fails the import aborts and the current
 * DB is left untouched.
 */
export declare function importRelayState(archivePath: string, options?: ImportOptions): Promise<ImportResult>;
export {};
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